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Iron‐Manganese Relationships in White Lupine Grown on a Calciaquoll
Author(s) -
Moraghan J. T.
Publication year - 1992
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1992.03615995005600020022x
Subject(s) - chlorosis , shoot , chemistry , lupinus , perlite , horticulture , lupinus angustifolius , calcareous , manganese , loam , inoculation , botany , zoology , soil water , biology , ecology , organic chemistry
Abstract The Fe chelate of ethylenediamine‐di‐O‐hydroxphenylacetic acid (EDDHA) applied to calcareous soils strongly suppresses Mn accumulation in many plants with Strategy I Fe‐stress responses. However, white lupine ( Lupinus albus L. cv. Kiev), a legume with proteoid roots, does not show this typical suppression. This study was conducted to determine under greenhouse conditions the influence of NaH 2 PO 4 ‐P (0, 60, and 120 mg kg −1 ) and FeEDDHA‐Fe (0, 1, 2, 4, and 8 mg kg −1 ) rates on Mn accumulation by both inoculated ( Bradyrhizobium lupini ) and NH 4 NO 3 ‐N (80 mg kg −1 ) treated white lupine grown on a Wheatville loam (coarse‐silty over clayey, frigid Aeric Calciaquoll). Application of 60 and 120 mg P kg −1 decreased shoot Mn concentrations six‐ and 17‐fold, respectively, presumably due to suppression of proteoid roots. Inoculated plants generally had at least twice the shoot Mn concentration of their N‐treated counterparts. FeEDDHA had little effect on suppressing shoot Mn concentration except in plants treated with 120 mg P kg −1 . Symptoms atypical of P deficiency, apparently due to Mn toxicity, developed in plants grown without added P. In contrast, N‐treated plants grown with 120 mg P kg −1 and 8 mg Fe kg −1 developed an abnormality resembling Mn deficiency. Ammonium nitrate and added P, but not high shoot Mn concentration, intensified Fe‐deficiency chlorosis in leaflets. Complex interactions involving the source of N and availability of Fe, P, and Mn affected the growth of white lupine on the Wheatville soil.